In 2013 you can do a parent/child relationship Entity1 1:N Entity2 1:N Entity3 but:
- products are accessed through something like the order item, an intermediary entity
- you will not get multi-level navigation, you will get navigation to a record form, with a grid of child related records
You could probably try to build a custom web resource sub-navigation but that would be difficult to get it to render nicely.